Your Ryzen 5 2600X
I can help you.
This AMD Processor needs to be fed with DDR4 RAM - Which has a 2933 mhz Frequency, Here CAS Latency doesn't matter at all, Because of DDR4 RAMs have Higher CAS Latency (Which is Slower depending on Frequency). But Remember Feeding the CPU which requires it's need is more important than you think it is. So Buy a DDR4 RAM with 2933 mhz Frequency in DUAL CHANNEL, Because this needs to be fed with Dual Channel, i know, Don't get me wrong, It's not a Processor with IGPU (Integrated Graphics Processing Unit). But It's Important that you need to feed these Processors what they need of RAMs.
DDR4 - 2933mhz or Higher Frequency [Warning:Check if this Higher Frequency RAM Supported by the Motherboard!] . Buy it in DUAL CHANNEL.
For More Information Goto :
http://www.cpu-world.com/CPUs/Zen/AMD-Ryzen 5 2600X.html